Don't know what sexuality you are? Or are you learning about the many sexualities out there? Either way, here is a list of the most common sexualities in the LGBT+ community.
Homosexual: attraction to the same sex or gender.
Bisexual: attraction to two genders. Typically used to describe attraction to males and females, but it is not limited to those two.
Pansexual: attraction to all genders.
Asexual: no sexual attraction. Literally none.
Demisexual: attraction after a strong emotional bond has been formed.
There is also romantic orientations, which reflect sexual orientations. For example, an asexual person could be biromantic.
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Kyle's Transgender Survival Guide
RandomThis book will give you advice and information on trans stuff, but some of it can be useful for LGB as well.